Why your 1st COVID-19 shot is more protective than you might think
2021-05-01 from cbc.ca
This is an excerpt from Second Opinion, a weekly roundup of health and medical science news emailed to subscribers every Saturday morning. If you haven't subscribed yet, you can do that by clicking here.
After months of anxiously waiting, many newly vaccinated Canadians are left with more questions than answers — how protected am I after one dose of COVID-19 vaccine, when will I get my second shot and what can I do safely until then?
"It's the elephant in the room," said Dr. Zain Chagla, an infectious diseases physician at St. Joseph's Healthcare Hamilton and an associate professor at McMaster University. "Everyone is asking about this."
While we still don't have all the answers, there are some promising early signs that may help put your mind at ease until you get your second shot.
How protected am I until my second shot?
A recent study in The Lancet looked at more than 23,000 vaccinated healthcare workers in the United Kingdom from December to February and found the Pfizer-BioNTech vaccine was at least 70 per cent effective at preventing COVID-19 three weeks after the first dose.
Another Lancet study looked at more than 1.3 million people in Scotland during the same time period and found the Pfizer shot was more than 90 per cent effective at preventing hospitalization due to COVID-19 four to five weeks after the initial dose.
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